docs: def jwt_is_expired(self, access_token=None, leeway=0):
          """Validate JWT access token expiration.
  
          Args:
              access_token (str): Access token to validate. Defaults to ``None``.
              leeway (float): Time in seconds to adjust for local clock skew. Defaults to 0.
  
          Returns:
              bool: ``True`` if expired, otherwise ``False``.
  
          """
          if access_token is not None:
              exp = self._decode_exp(access_token)
          else:
              exp = self.jwt_exp
          now = time()
          if exp < (now - leeway):
              return True
          return False